Many times the choice of contraceptive method is not based on its function to prevent pregnancy, but is decided as a treatment for some gynecological problems. We know that the pill is recommended in many cases of irregular and painful menstruation and the same occurs with the intrauterine device or IUD that can also be used to alleviate the consequences of uterine fibroids.

What are fibroids

  • Fibroids are benign, non-cancerous tumors that appear in the uterus and are one of the most common ailments among the female population, especially after menopause. Although the cause of the appearance of fibroids in the uterus is not known, it has been proven that their development is related to estrogen.
  • The size of fibroids can increase over the years and surgical intervention is required to remove them, although if they remain small, their treatment is reduced to anti-inflammatories and hormones from contraceptive methods such as the pill or the Mirena IUD.
  • In many women, fibroids do not cause any symptoms, but in others pelvic cramps, pain during sexual intercourse, or pressure in the abdomen may appear. But the most common problems caused by fibroids are related to bleeding and menstruation.

How the Mirena IUD helps in the treatment of fibroids

  1. It is precisely when fibroids cause menstruation problems that the Mirena IUD appears as a treatment. And it is that with fibroids bleeding between periods and heavier and longer than normal menstruations can arise.
  2. What the Mirena IUD does is release hormones, but not estrogens, but progestogens, thus considerably reducing both bleeding and the duration of menstruation. In fact, one of the advantages that women who use this contraceptive method most appreciate is the short duration of menstruation, as well as the disappearance of the typical pain of the menstrual cycle.
  3. In any case, when faced with a problem such as fibroids, treatment should be recommended by a gynecologist after assessing the personal situation of each woman. Because we have to remember that not all women meet the physical conditions to use an IUD.
## Who is a good candidate for Mirena when fibroids are present The levonorgestrel-releasing intrauterine system (LNG-IUS, brand name Mirena) is a highly effective, reversible contraceptive that also provides local progestogenic therapy to the endometrium. When fibroids are present, candidacy depends less on age and more on the fibroid characteristics and symptoms. - **Good candidates** - Women with symptomatic heavy menstrual bleeding (menorrhagia) related to fibroids, especially when the uterine cavity is not grossly distorted. - Patients with small to moderate intramural fibroids (fibroids within the uterine wall) that do not significantly indent or distort the endometrial cavity. - Women with anemia secondary to heavy bleeding who need rapid reduction in blood loss as a bridge to definitive therapy or to avoid surgery. - Those desiring long-term contraception with the added benefit of reduced bleeding. - **Contraindications or relative exclusions** - Marked cavity distortion from submucosal fibroids (fibroids that protrude into the uterine cavity) — increased risk of expulsion and reduced efficacy. - Uterine size so enlarged that IUD placement is technically difficult or strings cannot be reliably visualized. - Current pregnancy, active pelvic infection (PID), unexplained vaginal bleeding, or known/suspected uterine or cervical malignancy. - Severe distortion on imaging: if ultrasound or hysteroscopy shows the IUS would sit on or be displaced by a large submucosal fibroid, consider alternate treatment. - **Pre-insertion evaluation** - **History and exam**: quantify bleeding (pads/tampons per day, soaking frequency), ask about pain, fertility desires, prior IUD expulsions. - **Transvaginal ultrasound**: essential when fibroids are suspected — defines number, size, and relationship to cavity. - **Hysteroscopy**: useful when ultrasound suggests a submucosal component or cavity distortion; can be diagnostic and therapeutic (resection of submucosal fibroid) before IUS insertion. Real example: - Case: A 38-year-old woman with 3 small intramural fibroids (1.5–2.5 cm), heavy bleeding (8–10 pads/day), iron deficiency anemia (Hb 10 g/dL). Transvaginal ultrasound shows no cavity distortion. Mirena was offered, inserted after counselling, and her bleeding reduced to spotting within 3 months; hemoglobin rose to 12.5 g/dL after 6 months with oral iron. She avoided surgery and retained fertility options. Practical advice: - If you have fibroids and heavy bleeding, ask your clinician for a pelvic ultrasound before IUD placement. - If a submucosal fibroid is suspected, discuss hysteroscopic resection first; after adequate cavity restoration, Mirena can be placed with lower expulsion risk. ## Management strategies: insertion technique, follow-up, complications and alternatives Actionable, clinician-level steps to maximize benefit and reduce complications when using Mirena for fibroid-related bleeding. - **Timing and preparation for insertion** - Ideal timing: insert during the first 7 days of the menstrual cycle when the cervix is naturally more dilated and pregnancy is unlikely. In non-menstrual insertions, perform a pregnancy test and counsel patient about possible interim pregnancy risk. - Pain control: recommend NSAID (e.g., ibuprofen 400–600 mg) 60–90 minutes before insertion. For women with severe cervical stenosis or anxious patients, consider local anesthetic (paracervical block) or oral analgesia. Routine prophylactic antibiotics are not indicated for low-risk patients. - Cervical preparation: use misoprostol selectively for women with a known tight cervix, prior cesarean scar concerns, or anticipated difficult insertion. - **Insertion technique with fibroids** - Use a gentle technique; if a large anterior/posterior submucosal fibroid displaces the cavity, consider hysteroscopic myomectomy first. - Ultrasound guidance during insertion is helpful when uterine anatomy is altered — it reduces risk of malposition or perforation. - Document uterine sounding length, deviations, and any resistance during placement. - **Post-insertion follow-up** - First check at 4–12 weeks: verify strings, assess bleeding pattern and pain. Encourage patient to report fever, severe pain, or heavy bleeding. - Annual exam thereafter unless issues arise. If strings are not palpable, offer ultrasound to confirm position. - Expect irregular bleeding and spotting in the first 3–6 months; by 6–12 months many women will have greatly reduced bleeding or amenorrhea. - **Complications and how to manage them** - **Expulsion**: more common in the presence of submucosal fibroids or immediately after insertion. If expulsion occurs, remove the device and consider re-insertion only if cavity distortion is not severe. - **Perforation**: rare (approx. 0.1%–0.8% depending on studies). If suspected (severe pain at insertion or missing IUD on ultrasound), obtain imaging and surgical consultation. - **Infection**: risk highest in the first 20 days post-insertion. Treat suspected PID promptly with antibiotics; remove the device only if no improvement or at clinician's discretion. - **Persistent bleeding**: if heavy bleeding continues >3–6 months despite IUS, evaluate for other causes (coagulopathy, endometrial pathology) and consider adjunctive measures or surgical options. - **Adjunct treatments and when to escalate** - **Medical adjuncts**: tranexamic acid for acute heavy bleeding episodes (short course), NSAIDs, and short courses of combined oral contraceptives may be used temporarily. - **Preoperative bridging**: Mirena can be used to reduce bleeding and improve hemoglobin before planned myomectomy or hysterectomy. - **When to consider other treatments** - Large submucosal fibroids distorting the cavity: hysteroscopic resection is preferred. - Multiple large fibroids causing bulk symptoms (pelvic pressure, urinary frequency): surgical options (myomectomy or hysterectomy) or uterine artery embolization may be necessary. - Persistent severe symptoms despite LNG-IUS: refer for imaging and specialty consultation. Real example: - Case: A 45-year-old woman with a single 4-cm submucosal fibroid had recurrent Mirena expulsions. She underwent hysteroscopic myomectomy to remove the submucosal component; Mirena was placed at the same procedure and she reported minimal bleeding thereafter. This illustrates that submucosal fibroids often need mechanical correction before an IUS can be effective. Practical advice for patients: - After Mirena insertion: expect some cramping and spotting. Use heat, NSAIDs, and rest for 24–48 hours. Check strings after your first period. Seek immediate care if you have fever, severe abdominal pain, or soak through a pad/hour. - Iron therapy: If anemic, begin iron supplementation. A common regimen is oral ferrous sulfate 325 mg (contains ~65 mg elemental iron) taken once daily or every other day to reduce side effects; discuss dosing with your clinician. For severe anemia (Hb <8 g/dL) or intolerance to oral iron, IV iron may be recommended. ## When Mirena is not enough: integrating Mirena with other fibroid treatments Mirena is a powerful tool for bleeding control but it is not a universal solution for all fibroid problems. Understand how to integrate it into a broader treatment plan. - **Combined medical strategies** - **GnRH agonists/antagonists**: Can induce temporary fibroid shrinkage and reduce uterine size before surgery. Mirena can be placed after a course of GnRH therapy to maintain reduced bleeding and help preserve anemia recovery. - **Selective progesterone receptor modulators (SPRMs)**: In some regions, SPRMs (e.g., ulipristal acetate where available) are used to control bleeding and reduce fibroid size preoperatively. Mirena may be used after careful clinician assessment. - **Tranexamic acid**: Useful for episodic control; not a long-term substitute but can be helpful during the initial few months after Mirena insertion when spotting is common. - **Surgical alternatives when appropriate** - **Hysteroscopic myomectomy**: Best for submucosal fibroids that cause cavity distortion or bleeding. - **Laparoscopic or open myomectomy**: For large intramural or subserosal fibroids causing bulk symptoms or infertility. - **Uterine artery embolization (UAE)**: Minimally invasive option to shrink fibroids; women should be counseled regarding effects on future fertility and potential for post-embolization symptoms. - **Hysterectomy**: Definitive treatment for uterine fibroids and bleeding when fertility is no longer desired. Case-based decision making: - Example 1: Young woman with single 2-cm intramural fibroid and heavy bleeding — offer Mirena first, monitor response 3–6 months. - Example 2: Woman with severe bulk symptoms from multiple large fibroids — Mirena may help bleeding but surgery or UAE likely needed. Practical clinician tips: - Document symptom scores (e.g., PBAC — pictorial blood assessment chart) before and after Mirena to objectively track improvement. - When counseling about expectations, be explicit: Mirena reduces bleeding for most patients but does not reliably shrink fibroid mass; symptom relief is the primary goal. ## FAQ ### Can Mirena shrink fibroids? Mirena is primarily effective at reducing endometrial bleeding by releasing levonorgestrel locally in the uterus. It is **not primarily a fibroid-shrinking therapy**. Some women may experience a modest decrease in fibroid size over time, likely due to reduced bleeding-related edema or local hormonal effects, but clinically significant shrinkage is not reliably predictable. If fibroid mass reduction is required (e.g., to relieve pressure symptoms), other treatments such as GnRH agonists/antagonists, uterine artery embolization, or surgery are more effective. ### Will Mirena make fibroids grow? There is **no strong evidence** that Mirena causes fibroid growth. Fibroid growth is influenced by systemic hormones (estrogen and progesterone) and age; most fibroids grow slowly and can increase in size over years regardless of Mirena use. However, because Mirena reduces bleeding, a woman may become more aware of bulk symptoms if the fibroid grows separately. Regular monitoring by ultrasound is reasonable if there is concern for change in size or new symptoms. ### If I have submucosal fibroids, can I still get a Mirena? Submucosal fibroids that **distort the uterine cavity** increase the risk of IUD expulsion and reduce the likelihood of symptom control. For small submucosal fibroids that minimally indent the cavity, Mirena may still be an option. If the distortion is significant, hysteroscopic removal (myomectomy) is often recommended first; Mirena can be placed afterward to control bleeding and aid recovery. A diagnostic hysteroscopy or high-quality transvaginal ultrasound should guide the decision. ### Does Mirena affect future fertility? Mirena's contraceptive effect is reversible. After removal, fertility typically returns quickly — many women conceive within a few months. Mirena does not cause permanent infertility. If you have underlying fibroid-related infertility, that underlying issue (size, number, or location of fibroids) may still need treatment to optimize fertility. Discuss fertility goals with your gynecologist before choosing long-term contraception vs surgical treatment. ### What are the common side effects and how should I manage them? Common side effects include irregular bleeding/spotting (most frequent in the first 3–6 months), amenorrhea (common by 12 months), breast tenderness, mood changes, acne, and headaches. Management strategies: - Expect irregular bleeding early; reassure patients this often settles by 6–12 months. - Use NSAIDs for cramping; short courses of tranexamic acid may help with heavier episodes. - For bothersome systemic side effects (mood changes, persistent acne), consider trial removal after discussion; symptoms often improve on removal. - Seek urgent care for severe abdominal pain, fever, or heavy bleeding (soaking a pad/hour). --- Category: Health Issues Topic: Mirena IUD, a contraceptive method that helps treat fibroids For more on contraception and gynecologic conditions, see [related topic](/blog). 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